Afterheat recovering device of I.C. engine

Abstract

Provided is a waste heat recovery device of an internal combustion engine. A circulation path (12) for circulating a heat medium in a cooling unit (6A) of an internal combustion engine (2) and an exhaust gas heat exchanger (9) utilizing exhaust gas of the internal combustion engine (2) is provided. The output side of the circulation path (12) is connected to an output heat exchanger provided in a hot water storage tank or the like. The heat medium introduced by the pump (10) circulates through the exhaust gas heat exchanger (9), the oil heat exchanger (5), and the water jacket (cooling part) (6A) in sequence, and then is output. The heat medium introduced into the exhaust gas heat exchanger (9) is set at a low temperature such that the water vapor in the exhaust gas is lower than its dew point by adjusting the flow rate or the like. The heat medium recovers the heat of the exhaust gas and the condensation heat of the exhaust gas, and guides it to the cooling unit (6A) to further raise the temperature. In this way, the waste heat of the internal combustion engine is effectively recovered.

Description

technical field [0001] The invention relates to a waste heat recovery device of an internal combustion engine, in particular to a waste heat recovery device of an internal combustion engine used as a power source of a cogeneration device and the like. Background technique [0002] In recent years, the need to consider the issue of environmental protection of the earth has increased, and in order to effectively use energy, technologies that recycle heat generated during operation, such as combined heat and power plants, have been receiving more and more attention. In this cogeneration device, since the temperature of the exhaust gas is higher than that of the high-temperature part of the main body of the internal combustion engine used as the power source, when recovering the waste heat, the heat recovery medium (generally, the cooling water of the internal combustion engine) is introduced into the cooling water of the internal combustion engine. The part recovers the heat, a...

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Problems solved by technology

Therefore, the temperature of the introduced heat medium cannot be said to be sufficiently lower than the dew point W, so it takes a long time for the exhaust gas to reach the dew point W, and as a result, the heat of condensation cannot be recovered with sufficient efficiency.

If the temperature of the exhaust gas can drop below the dew point W in the early stage, more heat of condensation can be recovered, but this problem has not been solved in the past

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